Mac: How To Change Python 2.7 to Python 3

In this video I am describing the precise way - how you can change the default Python 2.7 on Mac for Python 3.x - in my case it is Python 3.9 - and then change it back to Python 2.7 if necessary.

- by Vladimir Heinz

Enjoy my videos!

Chapters:

00:00 - Intro
00:08 - Explanation
00:39 - How to get version of your Python
00:52 - how to install brew
01:44 - check if brew works
01:49 - How to use brew to install python
02:51 - How to check the version of Python
02:58 - How to run Python3
03:22 - How to list all python versions / how to list all pythons
03:56 - How to make python3 the default python on your mac
04:20 - Checking if the switch of Python 2.7 to 3 works
04:29 - It could be necessary to uninstall Python3 and brew
04:44 - How to bring Python 2.7 back as default on your mac
05:10 - How to uninstall Python3
05:54 - How to uninstall brew from your mac
06:18 - Checking if brew was removed
06:48 - Finish

[sengyuu]

To make python3 the default version on your Mac, you can simply write :

alias python=python3

[anuragsspacestation]

BINGO! Done. Needed terminal to shut down in the end for change to execute. Worth the time. Thank YOU SO much.

[lizachuyaozhang]

Can someone help me plz (sos)? I am getting the error message of: ln: /usr/local/bin/python: Permission denied
How should I fix it?

[a.newman]

Thanks for sharing, but you need to work on your delivery: the screen/font is very small, you are going too fast, and you left no link for all those commands. When you do something, put your heart and thinking into it.

[Xzizia]

Doesn't work for me. I type ls -l /usr/local/bin/python* and it displays the same thing as on your computer. But following the second step (ln -s -f...) it does not work, still says 2.7.16....

[prajakt]

while downloading brew, got error by saying "/bin/bash: -c: option requires an to do ?

[adamvanhorn]

I keep getting permission denied when i try to change the default to the new python. How do I fix this?

[mdwilliamsbarrios]

Pueden cambiar la configuracion de Shell:
Ejecuten en terminal: nano ~/.bashrc
cierren terminal y vuelvan a ejecutarla, escriban. python --version ya deben mostrarsemla nueva versión. Espero les sirva

[paparedzy]

I think the issue is usr/local isnt created yet.. that is why we are getting this error, but not sure how to change the python directory to be there

[tianayee]

why mine still shows 2.7 no matter what method I tried... :(

[xpto_]

Is it normal to take a lot of time to download Homebrew? my iternet are working normal and fast.

[chandrajitsatapathy]

Thanks, restart the terminal for the changes

[ashishmali]

zsh: no matches found: /urs/local/bin/python* ? why this is coming ?

[lfg_o]

solo como dato para quien pueda servirle: puede cambiar a python3 colocando en la terminal lo siguiente despues de la flecha --> alias python = python3.11 (esto cambiará a python3 PERO volverá a 2.7 una vez cerrado)

[khaledchawa]

it doesn't let me list the pythons, do you know why or how I can fix this?

[atitsharma]

when i type"ln -s -f /usr/local/bin/python3.10 /usr/local/bin/python" it says Permission denied